fix(telegram): check updater/app state before disconnect

The disconnect() method was unconditionally calling updater.stop() and
app.stop(), causing errors when:
- The updater was not running (RuntimeError: This Updater is not running!)
- The app was None (AttributeError: 'NoneType' object has no attribute)

Changes:
- Check if updater exists and is running before stopping
- Check if app is running before stopping
- Only log warnings for actual errors, not expected shutdown states

Fixes spurious warnings during gateway shutdown.

gateway/platforms/telegram.py

@@ -275,8 +275,11 @@ class TelegramAdapter(BasePlatformAdapter):
 
         if self._app:
             try:
-                await self._app.updater.stop()
-                await self._app.stop()
+                # Only stop the updater if it's running
+                if self._app.updater and self._app.updater.running:
+                    await self._app.updater.stop()
+                if self._app.running:
+                    await self._app.stop()
                 await self._app.shutdown()
             except Exception as e:
                 logger.warning("[%s] Error during Telegram disconnect: %s", self.name, e, exc_info=True)